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Generic type - interfaces

Deepika Sahu answered on December 29, 2022 Popularity 8/10 Helpfulness 1/10

answer Generic type - interfaces

related generic interfaces

Generic type - interfaces

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// Java Program to illustrate Generic interfaces
  
// Importing java input output classes
import java.io.*;
  
// An interface that extends Comparable
interface MinMax<T extends Comparable<T> > {
    // Declaring abstract methods
    // Method with no body is abstract method
    T min();
    T max();
}
  
// Class 1 - Sub-class
// class extending Comparable and implementing interface
class MyClass<T extends Comparable<T> >
    implements MinMax<T> {
  
    // Member variable of 'MyClass' class
    T[] values;
  
    // Constructor of 'MyClass' class
    MyClass(T[] obj) { values = obj; }
  
    // Now, defining min() and max() methods
    // for MimMax interface computation
  
    // Defining abstract min() method
    public T min()
    {
        // 'T' is typename and 'o1' is object_name
        T o1 = values[0];
  
        // Iterating via for loop over elements using
        // length() method to get access of minimum element
        for (int i = 1; i < values.length; i++)
            if (values[i].compareTo(o1) < 0)
                o1 = values[i];
  
        // Return the minimum element in an array
        return o1;
    }
  
    // Defining abstract max() method
    public T max()
    {
        // 'T' is typename and 'o1' is object_name
        T o1 = values[0];
  
        // Iterating via for loop over elements using
        // length() method to get access of minimum element
        for (int i = 1; i < values.length; i++)
            if (values[i].compareTo(o1) > 0)
                o1 = values[i];
  
        // Return the maximum element in an array
        return o1;
    }
}
  
// Class 2 - Main class
// Implementation class
class GFG {
    // Main driver method
    public static void main(String[] args)
    {
        // Custom entries in an array
        Integer arr[] = { 3, 6, 2, 8, 6 };
  
        // Create an object of type as that of above class
        // by declaring Integer type objects, and
        // passing above array to constructor
        MyClass<Integer> obj1 = new MyClass<Integer>(arr);
  
        // Calling min() and max() methods over object, and
  
        // printing the minimum value from array elements
        System.out.println("Minimum value: " + obj1.min());
  
        // printing the maximum value from array elements
        System.out.println("Maximum value: " + obj1.max());
    }
}

Popularity 8/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: java

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Contributed on Dec 29 2022

Deepika Sahu

0 Answers Avg Quality 2/10

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generic interfaces

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Generics make a class, interface and, method, consider all (reference) types that are given dynamically as parameters.

This ensures type safety.

Generic class parameters are specified in angle brackets “<>” after the class name as of the instance variable.

Generic constructors are the same as generic methods.

For generic constructors after the public keyword and before the class name the type parameter must be placed.

Constructors can be invoked with any type of a parameter after defining a generic constructor.

A constructor is a block of code that initializes the newly created object.

It is an instance method with no return type.

The name of the constructor is same as the class name. Constructors can be Generic, despite its class is not Generic.

class GenericConstructor {
    // Member variable of this class
    private double v;
  
    // Constructor of this class where
    // T is typename and t is object
    <T extends Number> GenericConstructor(T t)
    {
        // Converting input number type to double
        // using the doubleValue() method
        v = t.doubleValue();
    }
  
    // Method of this class
    void show()
    {
        // Print statement whenever method is called
        System.out.println("v: " + v);
    }
}
  
// Class 2 - Implementation class
// Main class
class GFG {
    // Main driver method
    public static void main(String[] args)
    {
        // Display message
        System.out.println("Number to Double Conversion:");
  
        // Creating objects of type GenericConstructor i.e
        // og above class and providing custom inputs to
        // constructor as parameters
        GenericConstructor obj1
            = new GenericConstructor(10);
        GenericConstructor obj2
            = new GenericConstructor(136.8F);
  
        // Calling method - show() on the objects
        // using the dot operator
        obj1.show();
        obj2.show();
    }
}

https://www.geeksforgeeks.org/generic-constructors-and-interfaces-in-java/

Popularity 8/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 23 2023

Anjali Sharma

0 Answers Avg Quality 2/10

Generic type - interfaces

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